/* * In short-form directory entries the inode numbers are stored at variable * offset behind the entry name. If the entry stores a filetype value, then it * sits between the name and the inode number. The actual inode numbers can * come in two formats as well, either 4 bytes or 8 bytes wide.
*/
xfs_ino_t
xfs_dir2_sf_get_ino( struct xfs_mount *mp, struct xfs_dir2_sf_hdr *hdr, struct xfs_dir2_sf_entry *sfep)
{
uint8_t *from = sfep->name + sfep->namelen;
if (xfs_has_ftype(mp))
from++;
if (!hdr->i8count) return get_unaligned_be32(from); return get_unaligned_be64(from) & XFS_MAXINUMBER;
}
if (hdr->i8count)
put_unaligned_be64(ino, hdr->parent); else
put_unaligned_be32(ino, hdr->parent);
}
/* * The file type field is stored at the end of the name for filetype enabled * shortform directories, or not at all otherwise.
*/
uint8_t
xfs_dir2_sf_get_ftype( struct xfs_mount *mp, struct xfs_dir2_sf_entry *sfep)
{ if (xfs_has_ftype(mp)) {
uint8_t ftype = sfep->name[sfep->namelen];
if (xfs_has_ftype(mp))
sfep->name[sfep->namelen] = ftype;
}
/* * Given a block directory (dp/block), calculate its size as a shortform (sf) * directory and a header for the sf directory, if it will fit it the * space currently present in the inode. If it won't fit, the output * size is too big (but not accurate).
*/ int/* size for sf form */
xfs_dir2_block_sfsize(
xfs_inode_t *dp, /* incore inode pointer */
xfs_dir2_data_hdr_t *hdr, /* block directory data */
xfs_dir2_sf_hdr_t *sfhp) /* output: header for sf form */
{
xfs_dir2_dataptr_t addr; /* data entry address */
xfs_dir2_leaf_entry_t *blp; /* leaf area of the block */
xfs_dir2_block_tail_t *btp; /* tail area of the block */ int count; /* shortform entry count */
xfs_dir2_data_entry_t *dep; /* data entry in the block */ int i; /* block entry index */ int i8count; /* count of big-inode entries */ int isdot; /* entry is "." */ int isdotdot; /* entry is ".." */
xfs_mount_t *mp; /* mount structure pointer */ int namelen; /* total name bytes */
xfs_ino_t parent = 0; /* parent inode number */ int size=0; /* total computed size */ int has_ftype; struct xfs_da_geometry *geo;
mp = dp->i_mount;
geo = mp->m_dir_geo;
/* * if there is a filetype field, add the extra byte to the namelen * for each entry that we see.
*/
has_ftype = xfs_has_ftype(mp) ? 1 : 0;
/* * Iterate over the block's data entries by using the leaf pointers.
*/ for (i = 0; i < be32_to_cpu(btp->count); i++) { if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR) continue; /* * Calculate the pointer to the entry at hand.
*/
dep = (xfs_dir2_data_entry_t *)((char *)hdr +
xfs_dir2_dataptr_to_off(geo, addr)); /* * Detect . and .., so we can special-case them. * . is not included in sf directories. * .. is included by just the parent inode number.
*/
isdot = dep->namelen == 1 && dep->name[0] == '.';
isdotdot =
dep->namelen == 2 &&
dep->name[0] == '.' && dep->name[1] == '.';
if (!isdot)
i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
/* take into account the file type field */ if (!isdot && !isdotdot) {
count++;
namelen += dep->namelen + has_ftype;
} elseif (isdotdot)
parent = be64_to_cpu(dep->inumber); /* * Calculate the new size, see if we should give up yet.
*/
size = xfs_dir2_sf_hdr_size(i8count) + /* header */
count * 3 * sizeof(u8) + /* namelen + offset */
namelen + /* name */
(i8count ? /* inumber */
count * XFS_INO64_SIZE :
count * XFS_INO32_SIZE); if (size > xfs_inode_data_fork_size(dp)) return size; /* size value is a failure */
} /* * Create the output header, if it worked.
*/
sfhp->count = count;
sfhp->i8count = i8count;
xfs_dir2_sf_put_parent_ino(sfhp, parent); return size;
}
/* * Convert a block format directory to shortform. * Caller has already checked that it will fit, and built us a header.
*/ int/* error */
xfs_dir2_block_to_sf( struct xfs_da_args *args, /* operation arguments */ struct xfs_buf *bp, int size, /* shortform directory size */ struct xfs_dir2_sf_hdr *sfhp) /* shortform directory hdr */
{ struct xfs_inode *dp = args->dp; struct xfs_mount *mp = dp->i_mount; int error; /* error return value */ int logflags; /* inode logging flags */ struct xfs_dir2_sf_entry *sfep; /* shortform entry */ struct xfs_dir2_sf_hdr *sfp; /* shortform directory header */ unsignedint offset = args->geo->data_entry_offset; unsignedint end;
trace_xfs_dir2_block_to_sf(args);
/* * Allocate a temporary destination buffer the size of the inode to * format the data into. Once we have formatted the data, we can free * the block and copy the formatted data into the inode literal area.
*/
sfp = kmalloc(mp->m_sb.sb_inodesize, GFP_KERNEL | __GFP_NOFAIL);
memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));
/* * Loop over the active and unused entries. Stop when we reach the * leaf/tail portion of the block.
*/
end = xfs_dir3_data_end_offset(args->geo, bp->b_addr);
sfep = xfs_dir2_sf_firstentry(sfp); while (offset < end) { struct xfs_dir2_data_unused *dup = bp->b_addr + offset; struct xfs_dir2_data_entry *dep = bp->b_addr + offset;
/* * If it's unused, just skip over it.
*/ if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
offset += be16_to_cpu(dup->length); continue;
}
/* * Skip .
*/ if (dep->namelen == 1 && dep->name[0] == '.')
ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino); /* * Skip .., but make sure the inode number is right.
*/ elseif (dep->namelen == 2 &&
dep->name[0] == '.' && dep->name[1] == '.')
ASSERT(be64_to_cpu(dep->inumber) ==
xfs_dir2_sf_get_parent_ino(sfp)); /* * Normal entry, copy it into shortform.
*/ else {
sfep->namelen = dep->namelen;
xfs_dir2_sf_put_offset(sfep, offset);
memcpy(sfep->name, dep->name, dep->namelen);
xfs_dir2_sf_put_ino(mp, sfp, sfep,
be64_to_cpu(dep->inumber));
xfs_dir2_sf_put_ftype(mp, sfep,
xfs_dir2_data_get_ftype(mp, dep));
/* now we are done with the block, we can shrink the inode */
logflags = XFS_ILOG_CORE;
error = xfs_dir2_shrink_inode(args, args->geo->datablk, bp); if (error) {
ASSERT(error != -ENOSPC); goto out;
}
/* * The buffer is now unconditionally gone, whether * xfs_dir2_shrink_inode worked or not. * * Convert the inode to local format and copy the data in.
*/
ASSERT(dp->i_df.if_bytes == 0);
xfs_init_local_fork(dp, XFS_DATA_FORK, sfp, size);
dp->i_df.if_format = XFS_DINODE_FMT_LOCAL;
dp->i_disk_size = size;
/* * Add a name to a shortform directory. * There are two algorithms, "easy" and "hard" which we decide on * before changing anything. * Convert to block form if necessary, if the new entry won't fit.
*/ int/* error */
xfs_dir2_sf_addname(
xfs_da_args_t *args) /* operation arguments */
{ struct xfs_inode *dp = args->dp; struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data; int error; /* error return value */ int incr_isize; /* total change in size */ int new_isize; /* size after adding name */ int objchange; /* changing to 8-byte inodes */
xfs_dir2_data_aoff_t offset = 0; /* offset for new entry */ int pick; /* which algorithm to use */
xfs_dir2_sf_entry_t *sfep = NULL; /* shortform entry */
/* * Do we have to change to 8 byte inodes?
*/ if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) { /* * Yes, adjust the inode size. old count + (parent + new)
*/
incr_isize += (sfp->count + 2) * XFS_INO64_DIFF;
objchange = 1;
}
new_isize = (int)dp->i_disk_size + incr_isize; /* * Won't fit as shortform any more (due to size), * or the pick routine says it won't (due to offset values).
*/ if (new_isize > xfs_inode_data_fork_size(dp) ||
(pick =
xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) { /* * Just checking or no space reservation, it doesn't fit.
*/ if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0) return -ENOSPC; /* * Convert to block form then add the name.
*/
error = xfs_dir2_sf_to_block(args); if (error) return error; return xfs_dir2_block_addname(args);
} /* * Just checking, it fits.
*/ if (args->op_flags & XFS_DA_OP_JUSTCHECK) return 0; /* * Do it the easy way - just add it at the end.
*/ if (pick == 1)
xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize); /* * Do it the hard way - look for a place to insert the new entry. * Convert to 8 byte inode numbers first if necessary.
*/ else {
ASSERT(pick == 2); if (objchange)
xfs_dir2_sf_toino8(args);
xfs_dir2_sf_addname_hard(args, objchange, new_isize);
}
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA); return 0;
}
/* * Add the new entry the "easy" way. * This is copying the old directory and adding the new entry at the end. * Since it's sorted by "offset" we need room after the last offset * that's already there, and then room to convert to a block directory. * This is already checked by the pick routine.
*/ staticvoid
xfs_dir2_sf_addname_easy(
xfs_da_args_t *args, /* operation arguments */
xfs_dir2_sf_entry_t *sfep, /* pointer to new entry */
xfs_dir2_data_aoff_t offset, /* offset to use for new ent */ int new_isize) /* new directory size */
{ struct xfs_inode *dp = args->dp; struct xfs_mount *mp = dp->i_mount; struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data; int byteoff = (int)((char *)sfep - (char *)sfp);
/* * Grow the in-inode space.
*/
sfp = xfs_idata_realloc(dp, xfs_dir2_sf_entsize(mp, sfp, args->namelen),
XFS_DATA_FORK); /* * Need to set up again due to realloc of the inode data.
*/
sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff); /* * Fill in the new entry.
*/
sfep->namelen = args->namelen;
xfs_dir2_sf_put_offset(sfep, offset);
memcpy(sfep->name, args->name, sfep->namelen);
xfs_dir2_sf_put_ino(mp, sfp, sfep, args->inumber);
xfs_dir2_sf_put_ftype(mp, sfep, args->filetype);
/* * Update the header and inode.
*/
sfp->count++; if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
sfp->i8count++;
dp->i_disk_size = new_isize;
xfs_dir2_sf_check(args);
}
/* * Add the new entry the "hard" way. * The caller has already converted to 8 byte inode numbers if necessary, * in which case we need to leave the i8count at 1. * Find a hole that the new entry will fit into, and copy * the first part of the entries, the new entry, and the last part of * the entries.
*/ /* ARGSUSED */ staticvoid
xfs_dir2_sf_addname_hard(
xfs_da_args_t *args, /* operation arguments */ int objchange, /* changing inode number size */ int new_isize) /* new directory size */
{ struct xfs_inode *dp = args->dp; struct xfs_mount *mp = dp->i_mount; int add_datasize; /* data size need for new ent */ char *buf; /* buffer for old */ int eof; /* reached end of old dir */ int nbytes; /* temp for byte copies */
xfs_dir2_data_aoff_t new_offset; /* next offset value */
xfs_dir2_data_aoff_t offset; /* current offset value */ int old_isize; /* previous size */
xfs_dir2_sf_entry_t *oldsfep; /* entry in original dir */
xfs_dir2_sf_hdr_t *oldsfp; /* original shortform dir */
xfs_dir2_sf_entry_t *sfep; /* entry in new dir */
xfs_dir2_sf_hdr_t *sfp; /* new shortform dir */
/* * Copy the old directory to the stack buffer.
*/
old_isize = (int)dp->i_disk_size;
buf = kmalloc(old_isize, GFP_KERNEL | __GFP_NOFAIL);
oldsfp = (xfs_dir2_sf_hdr_t *)buf;
memcpy(oldsfp, dp->i_df.if_data, old_isize); /* * Loop over the old directory finding the place we're going * to insert the new entry. * If it's going to end up at the end then oldsfep will point there.
*/ for (offset = args->geo->data_first_offset,
oldsfep = xfs_dir2_sf_firstentry(oldsfp),
add_datasize = xfs_dir2_data_entsize(mp, args->namelen),
eof = (char *)oldsfep == &buf[old_isize];
!eof;
offset = new_offset + xfs_dir2_data_entsize(mp, oldsfep->namelen),
oldsfep = xfs_dir2_sf_nextentry(mp, oldsfp, oldsfep),
eof = (char *)oldsfep == &buf[old_isize]) {
new_offset = xfs_dir2_sf_get_offset(oldsfep); if (offset + add_datasize <= new_offset) break;
} /* * Get rid of the old directory, then allocate space for * the new one. We do this so xfs_idata_realloc won't copy * the data.
*/
xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
sfp = xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
/* * Copy the first part of the directory, including the header.
*/
nbytes = (int)((char *)oldsfep - (char *)oldsfp);
memcpy(sfp, oldsfp, nbytes);
sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes); /* * Fill in the new entry, and update the header counts.
*/
sfep->namelen = args->namelen;
xfs_dir2_sf_put_offset(sfep, offset);
memcpy(sfep->name, args->name, sfep->namelen);
xfs_dir2_sf_put_ino(mp, sfp, sfep, args->inumber);
xfs_dir2_sf_put_ftype(mp, sfep, args->filetype);
sfp->count++; if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
sfp->i8count++; /* * If there's more left to copy, do that.
*/ if (!eof) {
sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);
memcpy(sfep, oldsfep, old_isize - nbytes);
}
kfree(buf);
dp->i_disk_size = new_isize;
xfs_dir2_sf_check(args);
}
/* * Decide if the new entry will fit at all. * If it will fit, pick between adding the new entry to the end (easy) * or somewhere else (hard). * Return 0 (won't fit), 1 (easy), 2 (hard).
*/ /*ARGSUSED*/ staticint/* pick result */
xfs_dir2_sf_addname_pick(
xfs_da_args_t *args, /* operation arguments */ int objchange, /* inode # size changes */
xfs_dir2_sf_entry_t **sfepp, /* out(1): new entry ptr */
xfs_dir2_data_aoff_t *offsetp) /* out(1): new offset */
{ struct xfs_inode *dp = args->dp; struct xfs_mount *mp = dp->i_mount; int holefit; /* found hole it will fit in */ int i; /* entry number */
xfs_dir2_data_aoff_t offset; /* data block offset */
xfs_dir2_sf_entry_t *sfep; /* shortform entry */ struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data; int size; /* entry's data size */ int used; /* data bytes used */
size = xfs_dir2_data_entsize(mp, args->namelen);
offset = args->geo->data_first_offset;
sfep = xfs_dir2_sf_firstentry(sfp);
holefit = 0; /* * Loop over sf entries. * Keep track of data offset and whether we've seen a place * to insert the new entry.
*/ for (i = 0; i < sfp->count; i++) { if (!holefit)
holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);
offset = xfs_dir2_sf_get_offset(sfep) +
xfs_dir2_data_entsize(mp, sfep->namelen);
sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);
} /* * Calculate data bytes used excluding the new entry, if this * was a data block (block form directory).
*/
used = offset +
(sfp->count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
(uint)sizeof(xfs_dir2_block_tail_t); /* * If it won't fit in a block form then we can't insert it, * we'll go back, convert to block, then try the insert and convert * to leaf.
*/ if (used + (holefit ? 0 : size) > args->geo->blksize) return 0; /* * If changing the inode number size, do it the hard way.
*/ if (objchange) return 2; /* * If it won't fit at the end then do it the hard way (use the hole).
*/ if (used + size > args->geo->blksize) return 2; /* * Do it the easy way.
*/
*sfepp = sfep;
*offsetp = offset; return 1;
}
#ifdef DEBUG /* * Check consistency of shortform directory, assert if bad.
*/ staticvoid
xfs_dir2_sf_check(
xfs_da_args_t *args) /* operation arguments */
{ struct xfs_inode *dp = args->dp; struct xfs_mount *mp = dp->i_mount; struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data; int i; /* entry number */ int i8count; /* number of big inode#s */
xfs_ino_t ino; /* entry inode number */ int offset; /* data offset */
xfs_dir2_sf_entry_t *sfep; /* shortform dir entry */
/* Verify the consistency of an inline directory. */
xfs_failaddr_t
xfs_dir2_sf_verify( struct xfs_mount *mp, struct xfs_dir2_sf_hdr *sfp,
int64_t size)
{ struct xfs_dir2_sf_entry *sfep; struct xfs_dir2_sf_entry *next_sfep; char *endp;
xfs_ino_t ino; int i; int i8count; int offset; int error;
uint8_t filetype;
/* * Give up if the directory is way too short.
*/ if (size <= offsetof(struct xfs_dir2_sf_hdr, parent) ||
size < xfs_dir2_sf_hdr_size(sfp->i8count)) return __this_address;
/* Check all reported entries */
sfep = xfs_dir2_sf_firstentry(sfp); for (i = 0; i < sfp->count; i++) { /* * struct xfs_dir2_sf_entry has a variable length. * Check the fixed-offset parts of the structure are * within the data buffer.
*/ if (((char *)sfep + sizeof(*sfep)) >= endp) return __this_address;
/* Don't allow names with known bad length. */ if (sfep->namelen == 0) return __this_address;
/* * Check that the variable-length part of the structure is * within the data buffer. The next entry starts after the * name component, so nextentry is an acceptable test.
*/
next_sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep); if (endp < (char *)next_sfep) return __this_address;
/* Check that the offsets always increase. */ if (xfs_dir2_sf_get_offset(sfep) < offset) return __this_address;
sfep = next_sfep;
} if (i8count != sfp->i8count) return __this_address; if ((void *)sfep != (void *)endp) return __this_address;
/* Make sure this whole thing ought to be in local format. */ if (offset + (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
(uint)sizeof(xfs_dir2_block_tail_t) > mp->m_dir_geo->blksize) return __this_address;
return NULL;
}
/* * Create a new (shortform) directory.
*/ int/* error, always 0 */
xfs_dir2_sf_create(
xfs_da_args_t *args, /* operation arguments */
xfs_ino_t pino) /* parent inode number */
{
xfs_inode_t *dp; /* incore directory inode */ int i8count; /* parent inode is an 8-byte number */
xfs_dir2_sf_hdr_t *sfp; /* shortform structure */ int size; /* directory size */
trace_xfs_dir2_sf_create(args);
dp = args->dp;
ASSERT(dp != NULL);
ASSERT(dp->i_disk_size == 0); /* * If it's currently a zero-length extent file, * convert it to local format.
*/ if (dp->i_df.if_format == XFS_DINODE_FMT_EXTENTS) {
dp->i_df.if_format = XFS_DINODE_FMT_LOCAL;
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
}
ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);
ASSERT(dp->i_df.if_bytes == 0);
i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
size = xfs_dir2_sf_hdr_size(i8count);
/* * Make a buffer for the data and fill in the header.
*/
sfp = xfs_idata_realloc(dp, size, XFS_DATA_FORK);
sfp->i8count = i8count;
/* * Now can put in the inode number, since i8count is set.
*/
xfs_dir2_sf_put_parent_ino(sfp, pino);
sfp->count = 0;
dp->i_disk_size = size;
xfs_dir2_sf_check(args);
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA); return 0;
}
/* * Lookup an entry in a shortform directory. * Returns EEXIST if found, ENOENT if not found.
*/ int/* error */
xfs_dir2_sf_lookup(
xfs_da_args_t *args) /* operation arguments */
{ struct xfs_inode *dp = args->dp; struct xfs_mount *mp = dp->i_mount; struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data; int i; /* entry index */
xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */ enum xfs_dacmp cmp; /* comparison result */
xfs_dir2_sf_entry_t *ci_sfep; /* case-insens. entry */
trace_xfs_dir2_sf_lookup(args);
xfs_dir2_sf_check(args);
ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);
ASSERT(dp->i_disk_size >= offsetof(struct xfs_dir2_sf_hdr, parent));
ASSERT(dp->i_df.if_bytes == dp->i_disk_size);
ASSERT(sfp != NULL);
ASSERT(dp->i_disk_size >= xfs_dir2_sf_hdr_size(sfp->i8count)); /* * Special case for .
*/ if (args->namelen == 1 && args->name[0] == '.') {
args->inumber = dp->i_ino;
args->cmpresult = XFS_CMP_EXACT;
args->filetype = XFS_DIR3_FT_DIR; return -EEXIST;
} /* * Special case for ..
*/ if (args->namelen == 2 &&
args->name[0] == '.' && args->name[1] == '.') {
args->inumber = xfs_dir2_sf_get_parent_ino(sfp);
args->cmpresult = XFS_CMP_EXACT;
args->filetype = XFS_DIR3_FT_DIR; return -EEXIST;
} /* * Loop over all the entries trying to match ours.
*/
ci_sfep = NULL; for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep)) { /* * Compare name and if it's an exact match, return the inode * number. If it's the first case-insensitive match, store the * inode number and continue looking for an exact match.
*/
cmp = xfs_dir2_compname(args, sfep->name, sfep->namelen); if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
args->cmpresult = cmp;
args->inumber = xfs_dir2_sf_get_ino(mp, sfp, sfep);
args->filetype = xfs_dir2_sf_get_ftype(mp, sfep); if (cmp == XFS_CMP_EXACT) return -EEXIST;
ci_sfep = sfep;
}
}
ASSERT(args->op_flags & XFS_DA_OP_OKNOENT); /* * Here, we can only be doing a lookup (not a rename or replace). * If a case-insensitive match was not found, return -ENOENT.
*/ if (!ci_sfep) return -ENOENT; /* otherwise process the CI match as required by the caller */ return xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
}
/* * Remove an entry from a shortform directory.
*/ int/* error */
xfs_dir2_sf_removename(
xfs_da_args_t *args)
{ struct xfs_inode *dp = args->dp; struct xfs_mount *mp = dp->i_mount; struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data; int byteoff; /* offset of removed entry */ int entsize; /* this entry's size */ int i; /* shortform entry index */ int newsize; /* new inode size */ int oldsize; /* old inode size */
xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
trace_xfs_dir2_sf_removename(args);
ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);
oldsize = (int)dp->i_disk_size;
ASSERT(oldsize >= offsetof(struct xfs_dir2_sf_hdr, parent));
ASSERT(dp->i_df.if_bytes == oldsize);
ASSERT(sfp != NULL);
ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->i8count)); /* * Loop over the old directory entries. * Find the one we're deleting.
*/ for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep)) { if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
XFS_CMP_EXACT) {
ASSERT(xfs_dir2_sf_get_ino(mp, sfp, sfep) ==
args->inumber); break;
}
} /* * Didn't find it.
*/ if (i == sfp->count) return -ENOENT; /* * Calculate sizes.
*/
byteoff = (int)((char *)sfep - (char *)sfp);
entsize = xfs_dir2_sf_entsize(mp, sfp, args->namelen);
newsize = oldsize - entsize; /* * Copy the part if any after the removed entry, sliding it down.
*/ if (byteoff + entsize < oldsize)
memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
oldsize - (byteoff + entsize)); /* * Fix up the header and file size.
*/
sfp->count--;
dp->i_disk_size = newsize;
/* * Reallocate, making it smaller.
*/
sfp = xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
/* * Are we changing inode number size?
*/ if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) { if (sfp->i8count == 1)
xfs_dir2_sf_toino4(args); else
sfp->i8count--;
}
xfs_dir2_sf_check(args);
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA); return 0;
}
/* * Check whether the sf dir replace operation need more blocks.
*/ staticbool
xfs_dir2_sf_replace_needblock( struct xfs_inode *dp,
xfs_ino_t inum)
{ struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data; int newsize;
if (dp->i_df.if_format != XFS_DINODE_FMT_LOCAL) returnfalse;
/* * New inode number is large, and need to convert to 8-byte inodes.
*/ if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) { int error; /* error return value */
/* * Won't fit as shortform, convert to block then do replace.
*/ if (xfs_dir2_sf_replace_needblock(dp, args->inumber)) {
error = xfs_dir2_sf_to_block(args); if (error) return error; return xfs_dir2_block_replace(args);
} /* * Still fits, convert to 8-byte now.
*/
xfs_dir2_sf_toino8(args);
i8elevated = 1;
sfp = dp->i_df.if_data;
} else
i8elevated = 0;
ASSERT(args->namelen != 1 || args->name[0] != '.'); /* * Replace ..'s entry.
*/ if (args->namelen == 2 &&
args->name[0] == '.' && args->name[1] == '.') {
ino = xfs_dir2_sf_get_parent_ino(sfp);
ASSERT(args->inumber != ino);
xfs_dir2_sf_put_parent_ino(sfp, args->inumber);
} /* * Normal entry, look for the name.
*/ else { for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep)) { if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
XFS_CMP_EXACT) {
ino = xfs_dir2_sf_get_ino(mp, sfp, sfep);
ASSERT(args->inumber != ino);
xfs_dir2_sf_put_ino(mp, sfp, sfep,
args->inumber);
xfs_dir2_sf_put_ftype(mp, sfep, args->filetype); break;
}
} /* * Didn't find it.
*/ if (i == sfp->count) {
ASSERT(args->op_flags & XFS_DA_OP_OKNOENT); if (i8elevated)
xfs_dir2_sf_toino4(args); return -ENOENT;
}
} /* * See if the old number was large, the new number is small.
*/ if (ino > XFS_DIR2_MAX_SHORT_INUM &&
args->inumber <= XFS_DIR2_MAX_SHORT_INUM) { /* * And the old count was one, so need to convert to small.
*/ if (sfp->i8count == 1)
xfs_dir2_sf_toino4(args); else
sfp->i8count--;
} /* * See if the old number was small, the new number is large.
*/ if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
args->inumber > XFS_DIR2_MAX_SHORT_INUM) { /* * add to the i8count unless we just converted to 8-byte * inodes (which does an implied i8count = 1)
*/
ASSERT(sfp->i8count != 0); if (!i8elevated)
sfp->i8count++;
}
xfs_dir2_sf_check(args);
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA); return 0;
}
/* * Convert from 8-byte inode numbers to 4-byte inode numbers. * The last 8-byte inode number is gone, but the count is still 1.
*/ staticvoid
xfs_dir2_sf_toino4(
xfs_da_args_t *args) /* operation arguments */
{ struct xfs_inode *dp = args->dp; struct xfs_mount *mp = dp->i_mount; struct xfs_dir2_sf_hdr *oldsfp = dp->i_df.if_data; char *buf; /* old dir's buffer */ int i; /* entry index */ int newsize; /* new inode size */
xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */ int oldsize; /* old inode size */
xfs_dir2_sf_entry_t *sfep; /* new sf entry */
xfs_dir2_sf_hdr_t *sfp; /* new sf directory */
trace_xfs_dir2_sf_toino4(args);
/* * Copy the old directory to the buffer. * Then nuke it from the inode, and add the new buffer to the inode. * Don't want xfs_idata_realloc copying the data here.
*/
oldsize = dp->i_df.if_bytes;
buf = kmalloc(oldsize, GFP_KERNEL | __GFP_NOFAIL);
ASSERT(oldsfp->i8count == 1);
memcpy(buf, oldsfp, oldsize); /* * Compute the new inode size.
*/
newsize = oldsize - (oldsfp->count + 1) * XFS_INO64_DIFF;
xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
xfs_idata_realloc(dp, newsize, XFS_DATA_FORK); /* * Reset our pointers, the data has moved.
*/
oldsfp = (xfs_dir2_sf_hdr_t *)buf;
sfp = dp->i_df.if_data; /* * Fill in the new header.
*/
sfp->count = oldsfp->count;
sfp->i8count = 0;
xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_sf_get_parent_ino(oldsfp)); /* * Copy the entries field by field.
*/ for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
oldsfep = xfs_dir2_sf_firstentry(oldsfp);
i < sfp->count;
i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep),
oldsfep = xfs_dir2_sf_nextentry(mp, oldsfp, oldsfep)) {
sfep->namelen = oldsfep->namelen;
memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
memcpy(sfep->name, oldsfep->name, sfep->namelen);
xfs_dir2_sf_put_ino(mp, sfp, sfep,
xfs_dir2_sf_get_ino(mp, oldsfp, oldsfep));
xfs_dir2_sf_put_ftype(mp, sfep,
xfs_dir2_sf_get_ftype(mp, oldsfep));
} /* * Clean up the inode.
*/
kfree(buf);
dp->i_disk_size = newsize;
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
}
/* * Convert existing entries from 4-byte inode numbers to 8-byte inode numbers. * The new entry w/ an 8-byte inode number is not there yet; we leave with * i8count set to 1, but no corresponding 8-byte entry.
*/ staticvoid
xfs_dir2_sf_toino8(
xfs_da_args_t *args) /* operation arguments */
{ struct xfs_inode *dp = args->dp; struct xfs_mount *mp = dp->i_mount; struct xfs_dir2_sf_hdr *oldsfp = dp->i_df.if_data; char *buf; /* old dir's buffer */ int i; /* entry index */ int newsize; /* new inode size */
xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */ int oldsize; /* old inode size */
xfs_dir2_sf_entry_t *sfep; /* new sf entry */
xfs_dir2_sf_hdr_t *sfp; /* new sf directory */
trace_xfs_dir2_sf_toino8(args);
/* * Copy the old directory to the buffer. * Then nuke it from the inode, and add the new buffer to the inode. * Don't want xfs_idata_realloc copying the data here.
*/
oldsize = dp->i_df.if_bytes;
buf = kmalloc(oldsize, GFP_KERNEL | __GFP_NOFAIL);
ASSERT(oldsfp->i8count == 0);
memcpy(buf, oldsfp, oldsize); /* * Compute the new inode size (nb: entry count + 1 for parent)
*/
newsize = oldsize + (oldsfp->count + 1) * XFS_INO64_DIFF;
xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
xfs_idata_realloc(dp, newsize, XFS_DATA_FORK); /* * Reset our pointers, the data has moved.
*/
oldsfp = (xfs_dir2_sf_hdr_t *)buf;
sfp = dp->i_df.if_data; /* * Fill in the new header.
*/
sfp->count = oldsfp->count;
sfp->i8count = 1;
xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_sf_get_parent_ino(oldsfp)); /* * Copy the entries field by field.
*/ for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
oldsfep = xfs_dir2_sf_firstentry(oldsfp);
i < sfp->count;
i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep),
oldsfep = xfs_dir2_sf_nextentry(mp, oldsfp, oldsfep)) {
sfep->namelen = oldsfep->namelen;
memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
memcpy(sfep->name, oldsfep->name, sfep->namelen);
xfs_dir2_sf_put_ino(mp, sfp, sfep,
xfs_dir2_sf_get_ino(mp, oldsfp, oldsfep));
xfs_dir2_sf_put_ftype(mp, sfep,
xfs_dir2_sf_get_ftype(mp, oldsfep));
} /* * Clean up the inode.
*/
kfree(buf);
dp->i_disk_size = newsize;
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
}
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